#1**+1 **

Not sure if I am answering your question because I am reading it as the smallest possible amount for 1/a +1/b.

The way to solve this is by picking the smallest numbers you can choose, which are -5 and 1.

It would solve as 1/-5 + 1/1= 1-1/5

The final answer would be 4/5.

Hopefully this helps.

MobiusLoops Dec 4, 2020